2003 BMW 325i Stalled and wont start

I just purchased a 325i and drove it 3 hours home with no issues. Stopped
for gas half way started back up like normal. Parked it at home and this
morning it started right up. I came in the house for 10 minutes went back out
and it had stalled. Tried to start it and made one click (more like clunk).Lights
come on, radio, fan...alll working. Can hear fuel pump engage. Tried jumping
it thinking the extreme cold killed the brand new battery. Still the same clunk
when I turn the key. Onboard diagnostics shows 12 volt for battery so it
appears charged. Car only has valet key. The trunk button is not working.
Beautiful car but currently an ornament in my yard. Not sure where to start.